KR20010065944A - method and apparatus for detecting modem tone of radio port controller in wireless local loop system - Google Patents

Abstract

PURPOSE: An apparatus and method for detecting modem tones in a WLL(Wireless Local Loop) RPC(Radio Port Controller) is provided to carry out a modem tone detection function, having been executed in a subscriber interface module, in an RPC. CONSTITUTION: An apparatus for detecting modem tones in a WLL RPC consists of a memory block(41), an IPC(Inter Processor Communication) block(42), a CPU block(43), an echo canceller and modem tone detector block(44), a transcoder block(45), a multiplexing block(46), and a line driver block(47). The CPU block(43) controls the echo canceller and modem tone detector block(44) and the transcoder block(45) and initializes the multiplexing block(46). The memory block(41) is composed of a 2Mbyte SRAM, a 1Mbyte flash memory and a 512Kbyte ROM. The IPC block(42), executing communication through a 32bit parallel data bus, reports a modem tone detection signal to an upper-level block. The transcoder block(45), composed of an encoder(45a) and a decoder(45b), converts a PCM signal into an ADPCM signal and transmits it to a radio port through the multiplexing block(46) and the line driver block(47). The echo canceller and modem tone detector block(44) transmits tone detection information to a main switch through the IPC block(42) so as to bypass a PCM signal without transcoding.

Description

Modem tone detection apparatus of wireless subscriber network base station controller and its method {method and apparatus for detecting modem tone of radio port controller in wireless local loop system}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wireless local network (hereinafter referred to as a WLL). In particular, the base station controller can receive a modem tone detection function performed by a subscriber matching device in a WLL system, thereby making it compatible with other subscriber matching devices. The present invention relates to a modem tone detection device and a method of a WLL base station controller.

In general, the WLL system has a merit that it is much better than the radio wave environment of the mobile communication network in terms of use as a communication medium through a wireless channel.

In addition, the line-of-sight environment is secured, and the propagation path loss is about 20 dB / decade, so that it can serve a wider area with the same transmission power. Fading due to multipath is much less than that of point-to-point mobile communication network.

Due to these advantages, the development and research of the WLL system is actively underway, and the accompanying drawings of FIG. 1 show a schematic configuration of a general WLL network having the above advantages.

As shown in Fig. 1, network components include network subscriber station 10, 10 ', subscriber access devices 20, 20', base station 30, 30 ', base station controller 40, WLL switching station ( 50), a base station operating device 60, and the like, and additionally, a data communication matching device 70 (IWF: inter-working function) for data service, a home location register (HLR: Home Location Resister / Authentication Center) ( 80).

In addition, the billing center 100 connected to the network management sensor 90, the WLL switch 50 and the data communication matching device 70 is connected to the base station operating device 60 and the WLL switch 50 is further provided.

Let us explain the interface between the network components in the WLL system network configured as described above.

The subscriber access devices 20 and 20 'and the base stations 30 and 30' use the standard WLL radio access standard as the access standard, and the channel bandwidth is 10 MHz. The connection standard between the base stations 30 and 30 'and the base station controller 40 selects and uses E1 or HDSL, and the signaling method uses LAPD (Link Access Protocol D).

The base station controller 40 and the WLL switch 50 use E1 as a connection standard and use ITU-T.G965 as a signaling method.

In addition, the connection standard between the base station controller 40 and the base station operating device 60 uses Ethernet, and as a signaling method, Simple Network Management Protocol (SNMP), File Transfer Protocol (FTP), and Telecommunication Network (TELNET). Etc.

On the other hand, the base station controller 40 and the data communication matching device 70 uses E1 as the connection standard, and uses LAPD as the signaling method. In addition, the connection between the WLL switch 50 and the data communication matching device 70 uses E1 as the connection standard and R2 is used as the signaling method.

The connection standard between the WLL switch 50 and the home position register 80 uses E1, and IS-41C is used as the signaling method.

Let's look at the operation of the WLL system network connected through the connection standard and the signaling method in more detail.

First, the base station (30, 30 ') is a base station control module (RCP) that performs the overall management function for one base station, a modem module performing a signal processing function related to the CDMA channel, high power / low noise amplification and transmission and reception frequency conversion function RF module for performing the step, and a line connection module for performing the relay line (E1) connection function for matching with the base station controller 40, amplification of the transmission signal in the RF module, low noise amplification of the received signal, frequency down / up It performs conversion, reception of diversity through two antennas, high power / low noise amplification, and transmission / reception frequency conversion.

In addition, the modem module provides CDMA channels (pilot channel, sync channel, paging channel, access channel, signaling channel, traffic channel, packet traffic channel, packet access channel), digital baseband function processing, CDMA channel coding and decoding related functions. Do this.

The line connection module performs data communication with the base station controller 40 with respect to traffic and control information, and performs a relay line (E1 / HDSL) function for matching the base station controller 40.

The base station controller 40, which controls the base stations 30 and 30 ', is composed of a transcoder module, a call processing module, a switching module, and a matching module. The transcoder module is a 64 Kbps Pulse Code Modulation (PCM) voice coding signal. It includes a transcoder that performs the conversion function, and echo cancellation is implemented. In addition, the call processing module performs various call processing functions such as incoming / outgoing call processing support and message processing of the base station, subsystem status management in the base station controller 40, and control signal format between the WLL switch 50 and the subscriber access device. It is a processor that has a redundant structure for system reliability. The switching module also provides a traffic path between the base station matching device and the transcoder in the base station controller 40.

In addition, the matching module is composed of a WLL switch matching module, a base station matching module and a base station operating device (60) matching module, dual WLL switch (50) matching module for installing the base station controller 40 remotely with the WLL switch (50) If so, perform the E1 / G.965 digital heavy accounting function. In addition, the base station matching module performs the E1 / LAPD, HDSL relay line matching function between the base station and the base station control, and the base station operating device matching module performs the Ethernet / SNMP, FTP, TELNET matching function during the base station operating device-base station control period.

Next, the base station operating device 60 operates the base station controller 40, the base stations 30 and 30 ', and the subscriber access devices 20 and 20', and is responsible for maintenance and repair of each device.

FIG. 2 is a block diagram illustrating a detailed block configuration of the subscriber matching device shown in FIG. 1.

As shown in FIG. 2, the subscriber matching device 20 includes a wired telephone interface unit 21 which provides an interface for connecting a voice service terminal and a modem (such as a general wireline telephone service and a fax modem), and a comprehensive information communication network ( ISDN interface unit 22 providing an interface for accessing the ISDN service terminal to provide an Integrated Servoce Digital Network (ISDN) service, a serial input / output unit 23 providing an interface for accessing a data-only service terminal, and a wired telephone. Time switch unit 24 for multiplexing the signals transmitted from the interface unit 21, the ISDN interface unit 22, and the serial input / output unit 23, and demultiplexing the signals received from the base station 30 to the subscribers. ), And modulate the signal received from the time switch unit 24 to be transmitted to the base station 30, and demodulate the signal received from the base station 30. It consists of a W-CDMA modem 25 for transmission over a time switch (24).

The wired telephone interface unit 21 is a line interface unit 21a for transmitting and receiving an analog signal to and from the voice service terminal (wired telephone), and the line interface to detect a hook off of the voice service terminal. The power supply unit 21b for providing the DC loop current to the unit 21a and the analog signal received from the line interface unit 21a are adaptively predictively encoded and transmitted to the time switch 24, and from the time switch unit 24. An adaptive prediction coding codec 21c for converting the received adaptive-side coded signal into an analog signal and transmitting it to the line interface unit 21a, and a ring for generating and transmitting a tone signal when a call of the voice service terminal is detected. And the tone generating unit 21d.

The ISDN interface unit 22 generates a signal transmitted from the line interface unit 22a for transmitting and receiving a signal to and from the terminal for the ISDN service, and the line interface unit 22a as a frame, and transmits the signal to the time switch unit 24. The frame processing unit 22b converts the frame received from the time switch unit 24 into a signal recognizable by the ISDN service terminal and transmits the frame to the line interface unit 22a.

As described above, the function of detecting the modem tone in the WLL system is performed by the subscriber matching device. However, when a third party subscriber matching device without the modem tone detection function is installed in the WLL system under test, the modem tone cannot be detected. There is this.

Accordingly, the present invention has been made to solve the above-described problems according to the prior art, and an object of the present invention is to perform a modem tone detection function performed by a subscriber matching device in a base station controller, thereby enabling a subscriber matching device of another company. To provide a modem tone detection device of the WLL base station controller to be compatible with the.

Another object of the present invention is to provide a modem tone detection method of a WLL base station controller corresponding to the operation of the modem tone detection device.

A feature of the modem tone detection apparatus of the WLL base station controller according to the present invention for achieving the above object is a WLL system having a base station controller, a base station, an exchange, and a subscriber matching device connected to a modem or a fax machine. Modem tone detection means for detecting a tone signal of a fax, first control means for transmitting a modem tone detection message when a modem tone signal is detected by the modem tone detection unit, and receiving a modem tone detection message transmitted from the transmission means; Bypassing the PCM data transmitted and received from the base station or the exchange to the switch or base station so that the vocoding is not performed, the modem matching detection message is transmitted to the subscriber matching device so that the subscriber matching device does not perform the transcoding function. The second control means is mounted in the base station controller.

In addition, the characteristics of the modem tone detection method of the WLL base station controller according to the present invention is characterized in that the modem tone in the base station controller in the WLL system having a base station controller having a main controller, a base station, an exchange, and a subscriber matching device connected to a modem or a fax machine A signal detecting method, comprising: determining whether a modem tone signal such as a modem and a fax connected to the subscriber matching device is detected; When the modem tone signal is detected, transmitting a modem tone detection message to the main controller through IPC; Bypassing, by the main controller receiving the transmitted modem tone detection message, the PCM data transmitted and received from the switch or the base station to the switch or the base station; And transmitting the received modem tone detection message to the subscriber matching device so as to control the subscriber matching device not to perform transcoding.

1 is a block diagram illustrating a general broadband wireless subscriber network system;

FIG. 2 is a block diagram illustrating the detailed structure of the subscriber matching device shown in FIG. 1;

3 is a block diagram of an apparatus for detecting a modem tone of a base station controller of a wireless subscriber network according to the present invention;

4 is a flowchart illustrating an operation of a modem tone detection method of a wireless subscriber network base station controller according to the present invention;

<Explanation of symbols for main parts of drawing>

41: memory block 42: IPC block

43: CPU block 44: echo canceller and modem tone detection block

45: transcoder block 45a: encoder

45b: decoder 46: multiplexing block

47: line driver block

Hereinafter, an apparatus and method for detecting a modem tone of a WLL base station controller according to the present invention will be described in detail with reference to the accompanying drawings.

3 is a block diagram of a modem tone detection apparatus of a WLL base station controller according to the present invention. The block diagram of the present invention is a memory block 41, an IPC block 42, a CPU block 43, and an echo canceller. And a modem tone detection block 44, a transcoder block 45, a multiplexing block 46, and a line driver block 47, wherein the transcoder block 45 comprises an encoder 45a and a decoder 45b. It is composed.

First, the block configuration shown in FIG. 3 is an ECTU (Echo Canceller & Transcoding Unit) board in the base station controller. The ECTU board is located in the base station controller to convert / reverse PCM data into ADPCM data and echo canceling. Perform the function. In addition, it is a board having a function of detecting a modem tone and transmitting it to an RPC Main Control Unit (RMCU) that performs a call processing function in a base station controller through IPC (Inter Processor Communication).

The detailed function of each block shown in the ECTU board, that is, beam 3 will be described.

First, the CPU block 43 is composed of a 32 MHz oscillator and peripheral passive elements, controls the echo canceller and modem tone detection block 44 and the transcoder block 45, and initializes the multiplexing block 46. In addition, it provides the function to detect the modem tone from the PCM signal and report it to the higher level.

The memory block 41 is composed of 2Mbyte SRAM, 1Mbyte flash memory, and 512Kbyte ROM. The flash memory is used when downloading an application program.

The IPC block 42 uses a CUBIT chip of Transwitch for inter-processor communication, and performs communication through a 32-bit parallel data bus. The main function is to report the modem tone detection signal to the upper level. Channels with detected modem or fax tones are intended to be bypassed on the main switching board.

The transcoder block 45 is composed of an encoder 45a and a decoder 45b to convert the ADPCM signal transmitted from the base station into a PCM signal, and also to convert the PCM signal into an ADPCM signal, thereby multiplexing the block 46 and the line driver block. Transmission to the base station through 47.

Echo canceler and modem tone detection block 44 cancels echoes coming back from hybrid points that interface with regular subscribers at the exchange, and also detects modem or fax tone signals and bypasses PCM signals without transcoding them. Tone detection information is transmitted to the main switch through the IPC block 42.

The multiplexing block 46 comprises three chips, respectively, between the outer and transcoder block 45, between the transcoder block 45 and the echo canceller and modem tone detection block 44, the echo canceler and modem tone detection block ( It is mounted between 44 and outside. These chips multiplex in both directions: 8.192Mbps and 4.096Mbps, 4.096Mbps and 2.048Mbps, 2.048Mbps and 8.192Mbps, respectively.

Hereinafter, the modem tone signal processing operation in the ECTU board will be briefly described. The echo canceller and modem tone detection block 44 performs a function of detecting a tone signal of a modem. In certain registers, the corresponding bit of each channel is converted from "0" to "1".

The CPU block 43 receives the value of the bit of the modem tone detection register in a polling manner, checks whether the modem tone is detected, and, if a modem tone is detected, the modem tone through the IPC block 42 to the RMCU in the base station controller. It is sending a detection message.

On the other hand, the processing operation of the modem tone detection message in the base station controller is briefly described. First, the RMCU board receiving the modem tone detection message transmitted from the ECTU board has vocoding of PCM voice data transmitted and received from the exchange and the base station. This is not done and is to be bypassed directly to the exchange or base station.

Also, the modem matching signal is transmitted to the subscriber matching device so that the subscriber matching device does not have a cranking function.

Hereinafter, the modem tone detection method of the WLL base station controller according to the present invention will be described step by step with reference to FIG.

First, the internal register and the SCC register of the CPU block 43 in the ETCU board in the base station controller are set (S101).

Subsequently, the IPC block 42, the multiplexing block 46, and the echo canceller and modem tone detection block 44 in the ETCU board are initialized respectively under the control of the CPU block 43 (S102).

Subsequently, the ETCU board is activated (S103), and it is determined whether an MMC (Man Machine Command) command is input through the backboard (serial port) of the ETCU board (S104).

As a result of determination, when the MMC command is input, after analyzing the input command, the operation corresponding to the command is executed (S105), and when the command operation is terminated or the MMC command is not input, the modem tone signal is detected. (S106).

Subsequently, it is determined whether the modem tone signal is detected (S107). If the modem tone signal is detected as a result of the determination, the modem tone detection message is transmitted to the RMCU board in the base station controller (S106). However, when the modem tone signal is not detected, the operation is repeatedly performed by feeding back to the step S104.

The RMCU board receiving the modem tone detection message does not switch the PCM voice data transmitted and received from the exchange and the base station to the ETCU, that is, the PCM data is not vocoded into the ADPCM data through the ETCU board, and the PCM data is immediately transferred. By bypassing the switch or the base station, by transmitting a modem tone detection message to the subscriber matching device to prevent the subscriber matching device to perform a transcoding function (S109).

Modem tone detection device and method of the WLL base station controller according to the present invention as described above is designed to perform the modem tone detection function performed in the subscriber matching device in the base station controller, it is compatible with other subscriber matching devices This is a possible advantage.

Claims (4)

In a WLL system having a base station controller, a base station, an exchange, and a subscriber matching device connected to a modem or a fax machine, Modem tone detection means for detecting a tone signal of the modem or fax, first control means for transmitting a modem tone detection message when a modem tone signal is detected by the modem tone detection unit, and modem tone detection transmitted from the transmission means; Receives a message and bypasses PCM data transmitted and received from the base station or exchange to the exchange or base station to prevent vocoding, and transmits a modem tone detection message to the subscriber matching device to perform a transcoding function. And a second control means in the base station controller, the second tone control means to control the control unit so as not to operate. The method of claim 1, And the modem tone detection unit is configured to convert a bit corresponding to each channel from " 0 " to " 1 " in a specific register therein when a modem tone signal is detected. The method according to claim 1 or 2, The first control means receives a bit value of a register inside the modem tone detector by a polling method and checks whether the modem tone is detected, and if a modem tone is detected, a modem tone detection message through the IPC to the second control means. Modem tone detection device of the WLL base station controller, characterized in that for transmitting. A method for detecting a modem tone signal in a base station controller in a WLL system having a base station controller having a main controller, a base station, an exchange, and a subscriber matching device connected to a modem or a fax machine, Determining whether a modem tone signal, such as a modem and a fax, connected to the subscriber matching device is detected; When the modem tone signal is detected, transmitting a modem tone detection message to the main controller through IPC; Bypassing, by the main controller receiving the transmitted modem tone detection message, the PCM data transmitted and received from the switch or the base station to the switch or the base station; And transmitting the received modem tone detection message to a subscriber matching device so as to control the subscriber matching device not to perform transcoding.